<template>
	<view class="u-wrap">
		<view class="u-search-box">
			<view class="status_bar">
						    <uni-search-bar :radius="100" @confirm="search"></uni-search-bar>
					</view>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item" :class="[current==index ? 'u-tab-item-active' : '']"
				 :data-current="index" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.name}}</text>
				</view>
			</scroll-view>
			<block v-for="(item,index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current==index">
					<image src="../../../static/img/tabbar-2/01.png" mode=""></image>
					<view class="page-view">
						<view class="class-item">
							<view class="item-container">
								<view class="thumb-box" v-for="(item1, index1) in item.foods" :key="index1">
									<view class="item-menu-name">{{item1.name}} &gt<br>
										<navigator class="item-menu-name-name" v-for="(item2,index2) in item1.content"
										:key="index2" :url="item2.url">
											{{item2.name}}
										</navigator>
									</view><br>
								</view>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
	import uniSearchBar from '@/components/uni-search-bar/uni-search-bar.vue'
	import classifyData from "@/components/common/classify.data.js";
	export default {
		data() {
			return {
				tabbar: classifyData,
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
			}
		},
		components: {
			uniSearchBar,classifyData
		},
		methods: {

			getPPT(url) {
				uni.navigateTo({
					url:url
				})
			},

			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if(index == this.current) return ;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if(this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({size: true},res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if(!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return ;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}
	.u-search-box {
		margin-top: 20px;
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
		background-color: rgb(234, 234, 234);
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: #878889;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
	}

	.u-tab-item {
		height: 110rpx;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}
	
	.u-tab-item-active {
		position: relative;
		color: #000;
		border-left: 4px solid #33B17B;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}
	
	.u-tab-item-active::before {
		content: "";
		position: absolute;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}	
	.right-box {
		background-color: #fff;
		padding-top: 11px;
		padding-left: 15px;
		
	}	
	.right-box image{
		width: 97%;
		height:80px;
		}
	.item-menu-name {
		color: #878889;
	}
	.item-menu-name-name{
		width: 78px;
		height: 33px;
		display: inline-block;
		margin: 5px;
		margin-top: 10px;
		margin-bottom: 8px;
		font-size: 13px;
		text-align: center;
		line-height: 33px;
		border-radius: 16px;
		border: solid 1px rgba(236, 238, 241, 1);
	}
</style>
